HAProxy "ERR_SSL_PROTOCOL_ERROR" Just started happening

Help!
1

Afternoon everyone, just recently my HAProxy (through pfSense) just started giving this error to external connections. HA Proxy has been up and running for years without issues.

If I browse to the site internally via the external URL it works fine.
If I browse externally, I get Error_SSL_Protocol_Error.

I tried updating the certificate (lets encrypt), updating HAProxy (version 0.60_5).

Not sure where to look and my research has not pointed to a direct cause yet.

2

Does this traffic actually hit haproxy? Do you have anything in the logs?

I suggest you check routing/NAT/firewall policies.

3

So while creating a new PfSense VM, I accidentally put the virtual WAN nic on the new VM and it grabbed a new IP.

After rebooting the old pfsense router to get the new IP, everything started working again.

Granted prior reboots did nothing. Somehow changing WAN IP’s fixed it…